Overhead door hinged suspension



March 12, 1968 D. 0. ANoREsEN 3,372,515

OVERHEAD DOOR HINGED SUSPENSION I 4 Sheets-Sheet 1 Filed July 29, 1966 ,Dowmp ,0. Ala 095$;

Mflch 968 D. 0. ANDRESEN 3,372,515

OVERHEAD DOOR HINGED SUSPENSION Filed July 29, 1966 i v r 4 Sheets-Sheet 2 March 12, 1968 D. 0. ANDRESEN 3,372,515

OVERHEAD DOOR HINGED SUSPENSION- I Filed July 29. 1966 4 Sheets-Sheet 3 jvveA/rae. (DO/W440 o0. AA QESEM,

firm ys March 12, 1968 o. D. ANDRESEN v 3,372,515

OVERHEAD DOOR HINGED SUSPENSION 4 Sheets-Sheet 4 Filed July 29, 1966 jvvewag ye/M4429 D. Avoesss/g United States Patent ()fitice 3,372,515 Patented Mar. 12, 1968 3,372,515 OVERHEAD DOGR HINGED SUSPENSION Donald D. Andresen, 24900 Santa Clara St., Hayward, Calif. 94544 Filed July 29, 1966, Ser. No. 568,822 13 Claims. (Cl. 49-205) This invention relates to overhead door suspensions and particularly to pivotal mountings for overhead swinging doors of the type generally employed in the entrances to garages, warehouses, airplane hangars, and the like building tructures.

In the overhead swinging door suspensions heretofore usually employed, the swinging movement of the door between its vertical, closed position and its substantially horizontal, overhead, opened position, either required a relatively large amount of head room within the enclosure, above the maximum height of the door header to permit swinging clearance of the upper leading edge of the door, or it required an initial inwardly projecting downward dipping motion, both of which were objectionable in low overhead door conditions and which were unsuited to operation by conventional motorized door openers.

Also, the swinging movement of such doors usually resulted in a substantial inward movement of the plane of the upper and intermediate portions of the door in its arcuate travel between closed and opened positions which required maintenance of considerable wasted clearance space inwardly of the plane of the closed door relative to the contents of the enclosing structure.

It is accordingly an object of the invention to overcome the disadvantages of the overhead door suspensions heretofore employed.

It is another object to provide an overhead door suspension requiring substantially no overhead clearance space within the enclosing structure above the level of the top of the door opening.

It is still another object of this invention to furnish an overhead door suspension with which the door has an arcuate movement between open and closed positions in which its inward motion of the plane of the door intermediate such positions is minimized.

-It is a further object of this invention to provide an overhead door suspension with which the door is imparted a varying arcuate movement between open and closed positions in which the intermediate inward and downward dip of the top leading edge thereof is held to a minimum.

It is -a still further object of the invention to provide an overhead door suspension with which the door suspended thereby is imparted an action which requires a minimum effort for movement between such closed and opened positions.

It is still a further object to provide an overhead door suspension of a construction whereby its installation is facilitated and simplified.

It is a still further object of this invention to provide an overhead door suspension which provides an improved and simplified mechanism for adjusting the action of the door and the forces required for its operation.

These and other objects and advantages and features of novelty will be evident hereinafter.

In the drawings which show by way of illustration and presently preferred embodiment of the invention and in which like reference characters designate the same or similar parts throughout the several views:

FIGURE 1 is a perspective, elevational view of the inside of a garage door and a door frame therefor, illustrating a typical installation of the apparatus of the invention, the door being in its vertical, closed position;

FIGURE 2 is a side elevational view of the door suspension assembly with a portion of the door to which it is attached shown in vertical section, as it would be viewed from line 2-2 of FIGURE 1;

FIGURE 3 is a fragmentary, rear elevational view of the door suspension assembly as viewed from line 33 of FIGURE 2;

FIGURE 4 is a fragmentary, detailed, enlarged rear elevational view of the portion of FIGURE 2 viewed from line 4-4 of FIGURE 2;

FIGURE 5 is an enlarged, vertical sectional view of the door suspension mechanism as viewed from line 55 of FIGURE 2;

FIGURE 6 is a top, plan view of the door suspension apparatus assembly with the door and door jamb upon which it is installed shown in fragmentary, horizontal section as it would be viewed from line 6-6 of FIG- URE 2;

FIGURE 7 is a perspective, elevational view of the door suspension apparatus assembly corresponding to FIGURES 2 and 3, and illustrating the mode of packaging the assembly unit in fully stressed, door closed position in readiness for installation;

FIGURE 8 is a side elevational view of the door jamb mounting bracket portion of the door suspension assembly alone, with the linkages and other parts removed to show typical dimensions and linkage pivot point locations for accomplishing the door movement illustrated in FIG- URE 9;

FIGURE 9 is a reduced sized view, partly diagrammatic and partly in side elevation of the door suspension apparatus of the invention, showing the door and door frame upon which it is installed partly in vertical section as it would be viewed from line 5-5 of FIGURE 1, and diagrammatically illustrating the movement and positions of the several links of the door suspension apparatus and the door between fully closed and fully opened po sitions;

"FIGURE 10 is a fragmentary, side elevational view of the upper end portion of FIGURE 2, further illustrating the mode of packaging the assembly shown in FIG- URE 7;

FIGURE 11 is a fragmentary, horizontal sectional view taken from line 11l1 of FIGURE 10;

FIGURE 12 is an enlarged detailed view of the adjustable, upper end spring attachment supporting bracket;

FIGURE 13 is an enlarged detailed vertical sectional view of the upper end spring attachment fitting as viewed from line 13-13 of FIGURE 2;

FIGURE 14 is a fragmentary, vertical, side elevational view of a portion of the apparatus shown in FIGURE 2 illustrating a modified form of the upper and lower end spring attachment fittings for accommodating an alternative pair of parallel springs; and

FIGURE 15 is an exploded, perspective, detailed view of the upper and lower end double spring fittings shown in FIGURE 14.

Apparatus Referring first primarily to FIGURE 1 in which a typical environment of the apparatus of the invention is illustrated, 10 is a conventional overhead type door illustrated in its closed position within a conventional door opening, viewed from the inner side thereof, said door opening comprising a pair of vertical door jam-bs 12 and 14 joined at the tops thereof with a door header 16.

The door 10 is pivotally mounted for swinging movement about an arcuately moving horizontal axis from a closed vertical position as shown in FIGURE 1, to a substantially horizontal, open position as illustrated in FIGURE 9, by means of a pair of door hinge suspension assemblies constructed in accordance with the invention, and shown generally at 18 and 20. It will be noted that the door suspension assemblies 18 and 20 of each pair are of opposite-hand construction adapting them to installation at inner, opposite ends of the door 10. For convenience of illustration, only the one-hand construction of the door suspension assembly shown generally at 18 is hereinafter described in detail.

The principal components of the door suspension assembly 18 comprise a jamb mounting bracket body shown generally at 22 which is fixedly attached at an intermediate height to the inner face of the door jamb 12, and an angle-sectioned door attachment bracket 28 which is attached at a correspondingly intermediate height to the inner face of an end frame member 30 of the door 10, with the jamb mounting bracket body 22 and the door attachment bracket 28 pivotally interconnected by a plurality of linkage members shown generally at 32, all of which are described in more detail as follows:

Referring again to the jamb mounting bracket body 22 as viewed in FIGURES 2, 7, 8 and 10, this member is of a semi-box-like construction having an approximately rectangular shaped, vertical face plate portion 34 bent along its upper edge at right angles to form a horizontal, outwardly extending, stiffening, angle leg 36 and bent along its right hand vertical edge at right angles to form an outwardly extending jamb attachment leg 38. The jamb attachment leg 38 is provided with a pair of holes 40 and 42 through the thickness thereof for attachment of the jamb mounting bracket body to the inner face of the door jamb 12 by suitable means such as the pair of lag screws as illustrated at 44 and 46 in FIGURES 2 and 3. The left-hand, vertical edge of the face plate portion 34, opposite the attachment leg 38, is provided with an integral extension which is bent at right angles thereto about a vertical line, in a direction opposite to leg 38 to form a horizontally extending leg 48 which is in turn again bent inwardly at right angles about a vertical line to form another leg extension plate 50, the plane of which is spaced from but extends parallel with, the plane of the face portion 34. The extension plate 50 is formed with a generally vertically extending but obliquely directed slot 52 therethrough. The slope of the slot 52, as best shown in FIGURE 2, is such that its upper end is slightly closer to the plane of the jamb attachment angle leg 38 than the lower end thereof, and the inner edge 60 of the leg extension plate 50 is cut parallel with the slot 52. The purpose of and the actual magnitude of slope of the slot 52 and the parallel edge 60 will be hereinafter more fully described in connection with FIGURE 8.

Attached to the face of the extension plate 50 of the jamb mounting bracket 22 and extending horizontally therefrom is an adjustable spring anchor arm 54, such attachment being affected by means of a bolt 56 which passes through a hole adjacent one end of the spring anchor arm 54 and through the oblique slot 52, whereby the spring anchor arm 54 is adjustably clamped to the extension plate 50 for adjustment thereon to any required horizontal position within the limit of the length of the slot 52. A rectangular guide lug member 58 is attached to the face of the spring anchor arm 54 in such position as to ride guidingly along the sloping edge 60 of the leg extension 50 to retain the spring anchor arm 54 in arigid, horizontal position throughout the range of adjustable position thereof in slot 52. The end of the spring anchor arm 54 opposite that through which the hole 55 and adjusting bolt 56 extends, is provided with a horizontally extending, integrally attached shouldered stud 62, threaded at its outer end portion as best shown in FIGURES 12 and 13, to which the upper hooked end 64 of an elongated actuator spring 66 is pivotally attached, such pivotal attachment being accomplished by a rotatable bushing 67 retained by a Washer 68 which is in turn retained on the threaded end portion of stud 62 by means of a nut 70.

The lower end of the elongated actuator spring 66 is pivotally attached adjacent the lower end of the door attachment bracket 28 by means of an adjustable spring attachment assembly best shown in FIGURE 4. The spring attachment assembly comprises an angle-shaped spring anchor member 72, one leg 74 of which is pivotally connected by a shoulder bolt 76 to one leg of the door attachment bracket 28, and the other leg 78 of which having vertically adjustably connected thereto an I-bolt 80 having an eye 82 at the outer end thereof, through which the lower hooked end 84 of the actuator spring 66 is ooked. Lengthwise, spring-tensioning adjustment of the I-bolt 80 is effected by means of a pair of nuts 86 and 88 threaded on to the lower end thereof into clamping position against opposite sides of the leg 78 of the spring anchor bracket 72.

Referring again to the jamb-mounting bracket body 22, the face plate portion 34 thereof as best shown in FIG- URE 8, is provided with an upper linkage pivot bolt hole 81 and a lower linkage pivot bolt hole 83 through which, as shown in the other figures, pivot shoulder bolts 82 and 84 extend. A stop bolt hole 85 is provided intermediate the pivot bolt holes 81 and 83 through which a stop bolt 37 extends.

Referring next more particularly to the linkage members shown generally at 32, an elongated lower hinge arm 88 is pivotally connected at its upper end to the beforementioned lower linkage pivot shoulder bolt 84 ,in the face plate portion 34, and at its lower end to a shoulder bolt 96 fastened through the outer end portion of a lower arm pivot supporting gusset plate 98. As best shown in FIGURE 2, the pivot-supporting gusset plate 98 is vertically adjustably bolted to and extends laterally in a plane parallel with the laterally extending leg 100 of the door attachment bracket 28. The gusset plate 98 is adjustably bolted to the leg 100 of the door attachment bracket 28 by means of a pair of bolts 102 and 104 which extend through the thickness of the pivot-supporting gusset plate 98 and through longitudinally elongated slotted holes 106 and 108, respectively, formed in the aforesaid inwardly extending leg 100.

Pivotally connected at its upper end to the beforementioned upper linkage pivot bolt 82 in the plate portion 34 of the bracket body 22 is an upper scissor link member 112. The lower end of the upper scissor link member 112 is fioatingly pivotally connected to the upper end of a lower scissor link member 118 by means of a pivot bolt 1 16, the lower end of which is, in turn, pivotally connected by a pivot bolt 122 to the lower hinge arm 88 at a point longitudinally separated a relatively short distance from but adjacent to the pivot bolt 84.

An elongated upper hinge arm 92 is pivotally connected at its upper end to the floating pivot formed by the pivot bolt 116 which fioatingly pivotally interconnects the lower and upper ends of the upper scissor link member 112 and lower scissor link member 118 respectively, as beforedescribed. The lower end of the upper hinge arm 92 is pivotally connected to the door attachment bracket 28 by a pivot bolt 124 which passes through the inwardly extending leg 100 of the door attachment bracket 28, at a point a substantial distance above the point of attachment of the lower arm pivot-supporting gusset plate 98.

The door attachment bracket 28 is attached to the inner face of the end frame member 30 of the door 10 by suitable means such as a plurality of lag screws which pass through holes in the leg 101 of the door attachment bracket 28 and into the end frame member, as illustrated at 126 and 128 in FIGURE 2.

The face plate 34 of the jamb-mounting bracket body 22 is provided, at an approximately central portion thereof, with a stop bolt 132 fixed through the beforementioned stop bolt hole 85, and which, in operation, serves to prevent the scissor link members 112 and 118 from pivoting in a direction toward the face of the door 10 past the positions thereof, illustrated in FIGURES 2, 7 and 10.

Referring next primarily to FIGURES 14 and 15, a modified, double actuator spring arrangement is shown employing a pair of elongated, parallel actuator springs 134 and 136. The upper end of the actuator springs 134 and 136 are provided with a swivel, end attachment fitting shown generally at 140 in FIGURES 14 and 15, such fitting comprising an E-shaped connector member 142 having a central stem 144 and outer, parallel prongs 146 and 148 separated by open-ended slots 15% and 152. The upper hooked ends 154 and 156 of a pair of parallel springs 134 and 136, respectively, make hooking connection through the slots 150 and 152, respectively, as best shown in FIGURE 14. The central stem 144 of the spring end attachment fitting 1413 is provided with a hole 158 through which the threaded stud 62 of the spring anchor arm 54 passes. The attachment fitting 140 is pivotally retained on the stud 62 and at the same time the hooked ends 154 and 156 of the actuator springs 134 and 136 are secured inescapably in the slots 150 and 152 of the connector member 142 by means of a washer 164 which is held in engagement with the face of the connector member 142 by means of a nut 165. The lower ends of the parallel actuator springs 134 and 136 are provided with a swivel end attachment fitting shown generally at 176, having a E-shaped connector member 178 which is shaped similarly to the beforedescribed E-shaped connector member 142. The lower hooked ends 168 and 170 of the actuator springs 134 and 136, respectively, make inescapable hooked connection in slots 172 and 174 of the E-shaped connector member 178 and are secured therein by means of a washer 181 which is secured to the E-shaped connector member 178 by means of a bolt 182 which passes through a hole 184 in the connector member 178 and is secured in place by a nut 186. The central stern portion 191! of the spring end connector member 178 is provided with an integrally attached stem 192 threaded as shown at 194 adjacent its lower end. The lower threaded end 1% of the stem 192 is pivotally secured to angle bracket '72, one leg '74 of which is pivotally connected to the leg 100 of the door attachment beam 23 by means of a shoulder bolt 76, as herein beforedescribed in connection with the same portion of the apparatus shown in FIGURE 4. The lower threaded end 194 of the stem 192 of the spring end connector member 178 is attached to the leg '78 of the spring anchor bracket 72 by means of a pair of threaded retaining nuts 1% and 198 in a manner similar to that herein beforedescribed in connection with the spring connector apparatus shown in FIGURE 4. The tension in the pair of springs 134 and 136 may be adjusted to accommodate the size and weight of the door by adjusting the vertical position of the stem 19?; relative to the spring anchor bracket 72 by means of the retaining nuts 196 and 198.

Referring again principally to FIGURES 7, l and 11, the entire door suspension assembly 18 is preferably packaged for delivery in a fully closed, spring tensioned condition in readiness for mounting upon an overhead door initially placed in its closed position as shown in FIG- URE l. The door suspension assembly is retained in such fully closed and tensioned condition by means of a disposable wooden spacer member 2690 which is positioned between adjacent inner and outer faces of the face plate portion 34 of the jamb mounting bracket 22 and the leg 100 of the door attachment bracket 28, the upper end thereof being bolted in such position by a pair of disposable bolts 202 and 204 which pass through the combined thickness of the plate portion 34, the spacer member 2190 and the leg 1% of the door attachment bracket 28, as best shown in FIGURE 11. The wooden spacer member 2190 extends along the length of the door attachment bracket 28 to a point slightly below the lower pivot supporting plate 98 and is bolted thereto by means of a disposable bolt 206. The tension in the actuator spring 66 or actuator springs 134 and 136, as the case may be, is thereby resisted by the disposable wooden spacer member 200, and the door suspension assembly 18 thereby initially maintained in its fully loaded condition corresponding to that at which it is positioned when the door to which it is attached is closed.

In the installation of the door suspension assembly 18 the door 10 is initially placed in the door opening in its closed position as illustrated in FIGURE 1, and suitably supported in such position on the door suspension assembly 18 is manually placed in position with the jamb attachment leg 38 of the jarnb mounting bracket 22 in engagement with the inner face of the door jamb 12, and with the inner face of the leg 101 of the attachment bracket 28 similarly in engagement with the inner face of the door end frame member 30. Attachment of the jamb mounting bracket 22 is then completed by insertion of the lag screws 44 and 46 through the holes 40 and 42, respectively, of the jairnb attachment leg 38 and screwed into the door jamb 12. Similarly, lag screws as shown at 126 and 128 are inserted through the holes as shown at 129, and 131 through the leg 101 of the door attachment bracket 28 and screwed into the end frame member 30 of the door 10.

Following such installation of the door suspension assembly 18 it is only necessary then to remove the disposable wooden spacer member 200 by removing the bolts 262, 204 and 205 and then, except for possible minor adjustments in tension of the actuator springs, the door is in readiness for operation. By this method of installation the arduous and sometimes hazardous installation of actuator springs and their proper tensioning subsequent to installation of the door suspension hardware is eliminated. A considerable saving of installation time and increased safety in so doing is thereby accomplished.

In the herein beforedescribed installation of the door suspension assembly 18 and its attachment to the door jamb and door frame, it is necessary that the vertical location of such attachment relative to the height of the undersurface of the door header 16 be approximately predetermined, if it is desired to have the door 10 assume a horizontal position when fully opened as illustrated in FIGURE 9. This position which is indicated by the arrowed dimension line 1 in FIGURE 9 is a predetermined constant value of approximately 15" for all door suspension assemblies having the linkage arrangement and dimensions of the device herein described. The apparatus is thus capable of accommodating any size of door, it only being necessary that in the installation, the predetermined dimension D, that is, the distance of the door attachment bracket 28 below the undersurface of the door header 16, be adhered to.

Referring again to FIGURE 9 in more detail, which diagrammatically illustrates the sequence of positions of the door between fully opened and fully closed positions, it will be noted that the action of the linkage members and binge arms is such that the upper edge of the door 16) moves along a path illustrated by the broken line 210 which departs only slightly from a purely horizontal movement. Thus the upper edge of the door departs onl a negligible distance from a path either above or below the lower surface of the door jamb and thus does not require any substantial clearance space either above or below the height of the door jamb within the enclosure which the door serves.

The movement of the upper edge of the door is also thus well suited for its attachment to a power-driven linkage member of a motorized door opener.

The herein-beforedescribed novel movement of the door is accomplished by the particular number and arrangement of linkages herein described and for best results requires a definite predetermined relationship or ratio between the lengths of the links of the linkage members and hinge arms and the positions of their pivot points although some slight variations in dimensions may be tolerated.

Referring mainly to FIGURES 2 and 8, a specific example of the dimensional positions of the pivot points in the door attachment bracket, and the linkage lengths which have been found suitable for accomplishing the herein beforedescribed action of the apparatus, is shown. The corresponding linkage dimensions for operation together with the dimensions shown in FIGURES 2 and 8 are as follows:

From the foregoing dimensions it will be seen that the working ratios of the lengths between pivot points of arm 88, arm 92, scissor link 112 and scissor link 118 and between pivot points 34 and 122 are approximately 4.4, 4, l, 1 and 0.3, respectively.

The horizontal distance, indicated at H in FIGURES 2 and 9, between the outer face of leg 101 of the door attachment bracket 28 and the face of the jamb attachment leg 38 of the jamb mounting bracket 22 may be adjusted between relatively narrow limits to suit the installation by adjustment of the vertical position of the lower pivot supporting plate d8 on the leg 1th] of the door attachment bracket 28 as provided by the elongated holes 106, 108 therein and the bolts 102 and 104 therethrough.

Adjustment of the tension in the actuator springs is preferably accomplished by adjustment of the vertical position of the spring anchor arm 54 as permitted by the oblique slot 52. It will be noted that as the anchor arm 54 is moved vertically, the horizontal position of the shoulder stud 62 to which the upper ends of the actuator spring 66 or springs 134 and 136 are attached, is automatically shifted in accordance with the slope of the slot 52 whereby, as the upper end portions of the anchor spring or springs, as the case may be, are moved upwardly or downwardly relative to the jamb mounting bracket 22, they are also simultaneously moved horizontally in a right-hand or left-hand direction, respectively, as viewed in the figures. Such action automatically compensates for the shift which would otherwise occur effectively in a left-hand direction relative to the lower spring anchor point 76 which would otherwise tend to shorten the effective lever arm upon which the actuator spring or springs act. Thus, with the arrangement shown the tensioning of the spring not only increases the force but also effectively compensates for and actually increases slightly the leverage arm upon which the springs act whereby the springs are enabled to balance a greater weight of door.

It is to be understood that the foregoing is illustrative only, and that the invention is not limited thereby, but includes all modifications thereof, within the scope of the invention as defined by the appended claims.

I claim:

1. In an overhead swinging door suspension, apparatus comprising:

a door jamb attachment body for attachment to a door jamb intermediate the top and bottom edges thereof;

:a first, elongated hinge arm pivotally attached at one end thereof to said body at a first pivot point thereon, and pivotally attached at the opposite end thereof to a second pivot point carried by means for attachment thereof to a door intermediate the top and bottom edges thereof;

a pair of scissor links pivotally interconnected at adjacent ends thereof by a common, fioating pivot means, and having one opposite end of one of said links pivotally connected to said body at a third pivot point thereon, upwardly spaced from said first pivot point, and having the other, opposite end of the other of said links pivotally connected to said first hinge arm at a fourth pivot point thereon, adjacent to but spaced longitudinally of said first hinge arm from said first pivot point toward said second pivot point; and

a second elongated hinge arm pivotally attached at one end thereof to said fioating pivot means of said pair of scissor links, and pivotally connected at the opposite end thereof to a filth pivot point carried by means for attachment thereof to said door, said second pivot point and said fifth pivot point being normally spaced-apart for such attachment to such door with the fifth pivot point located above the second pivot point relative to the door height.

2. In an overhead swinging door suspension, apparatus comprising:

a door jamb attachment body for attachment to a substantially vertical door jamb intermediate the top and bottom ends thereof;

a door attachment bracket for attachment to a door intermediate the top edge and bottom edge thereof;

a first elongated hinge arm pivotally attached at one end to said body at a first pivot point and pivotally attached at the opposite end to a second pivot point carried by said attachment bracket;

a pair of scissor links pivotally interconnected at adjacent ends thereof by a common, floating pivot means and having one opposite end of one of said links pivotally connected to said body at a third pivot point, upwardly spaced from said first pivot point, and having the other, opposite end of the other of said links pivotally connected to said first hinge arm at a fourth pivot point adjacent to but spaced a distance longitudinally of said first hinge arm from said first pivot point toward said second pivot point; and

a second elongated hinge arm pivotally attached at one end thereof to said common, floating pivot means of said pair of scissor links, and pivotally connected at the opposite end thereof to said bracket at a fifth pivot point, said second pivot point and said fifth pivot point being spaced-apart longitudinally of the axis of said attachment bracket.

3. Apparatus in accordance with claim 2 in which said distance is short relative to the distance between said first pivot point and said second pivot point.

4. Apparatus in accordance with claim 1 and:

resilient tension means connected at one end to the lower end portion of said attachment bracket and connected at the opposite end at an attachment point located intermediate a line running through said first and third pivot points and the longitudinal axis of said attachment bracket, when the assembly of said attachment bracket and said hinge arms and links is folded to the position corresponding to that which it has when attached to a door and when such door is in its closed position, whereby said attachment bracket, hinge arms and links are urged by said tension means to pivot from the aforesaid positions to positions corresponding to that which they have when attached to such door and such door is in its opened position.

5. Apparatus in accordance with claim 4 and:

tension adjusting means carried by said body for permitting adjustment of the position of said attachment point vertically relative to said body, said adjusting means including means automatically simultaneously to shift said attachment point horizontally predetermined different distances toward and away from the so-positioned longitudinal axis of said attachment bracket upon upward and downward vertical move= ment respectively of said adjusting means.

6. Apparatus according to claim 1 wherein:

said second pivot point and said fifth pivot point are distance is short relative to the distance between said first pivot point and said second pivot point.

9. Apparatus according to claim 1 in which the ratios of the lengths between opposite pivot points of said first hinge arm, said second hinge arm, said scissor links, and between said first pivot point and said fourth pivot point are approximately equal to the ratios of 4.4, 4, 1 and 0.3, respectively.

10. Apparatus in accordance with claim 7 and:

resilient tension means connected at one end to the lower end portion of said attachment bracket and connected at the opposite end at an attachment point located intermediate a line running through said first and third pivot points and the longitudinal axis of said attachment bracket, when said attachment bracket is in a position corresponding to that which it has when attached to a closed door.

11. Apparatus in accordance with claim 10 and:

tension adjusting means carried by said body for permitting adjustment of the position of said attachment point vertically relative to said body, said adjusting means including means automatically simultaneously to shift said attachment point horizontally predetermined different distances toward and away from the so-positioned longitudinal axis of said attachment bracket upon upward and downward vertical movement respectively of said adjusting means.

12. Apparatus in accordance with claim 2 and:

disposable means for releasably retaining said assembly prior to and in readiness for installation on a door in said folded, fully tensioned position, said means comprising:

a spacer member initially positioned between said door attachment bracket and the adjacent face of said jamb attachment body;

and releasable attachment means releasably clamping said door attachment bracket, spacer member and jamb attachment body together in the aforesaid position.

13. Apparatus in accordance with claim 4 and:

disposable means for releasably retaining said assembly prior to and in readiness for installation on a door in said folded, fully tensioned position, said means comprising:

an elongated spacer member initially positioned between said door attachment bracket and the adjacent face of said jarnb attachment body, and extending therefrom adjacent to and parallel with said attachment body to a point adjacent the said second pivot point, and releasable attachment means releasably clamping said door attachment bracket, spacer member and jamb attachment body together in the aforesaid position.

References Cited UNITED STATES PATENTS 2,328,204 8/1943 Ferris 49-206 2,516,196 7/ 1950 Fowler 49205 X 2,557,833 6/1951 McFarlane 49205 2,603,826 7/1952 Bobisch 49205 X 3,254,364 7/1966 Lipking 49-205 X DAVID J. WILLIAMOWSKY, Primary Examiner. DENNIS L. TAYLOR, Assistant Examiner. 

2. IN AN OVERHEAD SWINGING DOOR SUSPENSION, APPARATUS COMPRISING: A DOOR JAMB ATTACHMENT BODY FOR ATTACHMENT TO A SUBSTANTIALLY VERTICAL DOOR JAMB INTERMEDIATE THE TOP AND BOTTOM ENDS THEREOF; A DOOR ATTACHMENT BRACKET FOR ATTACHMENT TO A DOOR INTERMEDIATE THE TOP EDGE AND BOTTOM EDGE THEREOF A FIRST ELONGATED HINGE ARM PIVOTALLY ATTACHED AT ONE END TO SAID BODY AT A FIRST PIVOT POINT AND PIVOTALLY ATTACHED AT THE OPPOSITE END TO A SECOND PIVOT POINT CARRIED BY SAID ATTACHMENT BRACKET; A PAIR OF SCISSOR LINKS PIVOTALLY INTERCONNECTED AT ADJACENT ENDS THEREOF BY A COMMON, FLOATING PIVOT MEANS AND HAVING ONE OPPOSITE END OF ONE OF SAID LINKS PIVOTALLY CONNECTED TO SAID BODY AT A THIRD PIVOT POINT, UPWARDLY SPACED FROM SAID FIRST PIVOT POINT, AND HAVING THE OTHER, OPPOSITE END OF THE OTHER OF SAID LINKS PIVOTALLY CONNECTED TO SAID FIRST HINGE ARM AT A FOURTH PIVOT POINT ADJACENT TO BUT SPACED A DISTANCE LONGITUDINALLY OF SAID FIRST HINGE ARM FROM SAID FIRST PIVOT POINT TOWARD SAID SECOND PIVOT POINT; AND A SECOND ELONGATED HINGE ARM PIVOTALLY ATTACHED AT ONE END THEREOF TO SAID COMMON, FLOATING PIVOT MEANS OF SAID PAIR OF SCISSOR LINKS, AND PIVOTALLY CONNECTED AT THE OPPOSITE END THEREOF TO SAID BRACKET AT A FIFTH PIVOT POINT, SAID SECOND PIVOT POINT AND SAID FIFTH PIVOT POINT BEING SPACED-APART LONGITUDINALLY OF THE AXIS OF SAID ATTACHMENT BRACKET. 